Retaining member for edge-setting tools.



J. CAVANAGH.

RETAINING MEMBER FOR EDGE SETTING TOOLS.

APPLICATION FILED SEPT. 20. 1915.

L3U2,51Un Patented May 6, 1919.

JAMES CAVANAG-H, 0F BOSTON, MASSACHUSETTS, ASSIGNOR, BY MESNE ASSIGNMENTS,

T0 UNITED SHOE MACHINERY COBPORA PORATION OF NEW JERSEY.

TION, OF PATERSON, NEW JERSEY, A COR- RETAINING MEMBER FOR EDGESETTING TOOLS.

Application filed September 20, 1915.

To all who/n it may concern Be it known that I, JAMns GAVANAGH, a citizen of the United States, residing at Boston, in the county of Suifolk and State of Massachusetts, have invented certain Improvements in Retaining Members for Edge- Setting Tools, of which the following description, in connection with the accompanying drawings, is a specification, like reference characters on the drawings indicating like parts in the several figures.

This invention relates to retaining members and in particular to those used in burnishing machines for the purpose of detachably holding the burnishing tool upon its mounting. Heretofore the attempt has been made to use for this purpose a substantially flat leaf spring having a curved portion at one end which engages a corresponding indentation in the neck of theburnishing tool. It has been found, however, that such springs are unsatisfactory in use for several reasons. In the first place, it has been found exceedingly difiicult to temper them properly. They are either too soft, in'which case they will not hold the burnishing tool firmly, or else they are too hard, in which case they break at the hole through which the attaching and adjusting screw is driven.

It has been proposed to remedy this difficulty by forming the retaining member of wire bent in U-sha-pe having a roller mounted at the middle point of the U for engagement with the indentation in the neck of the tool. It has been found, however, that such a device is too expensive to manufacture and it is not going into general use.

It is the object of my invention to provide a retaining member which shall obviate the disadvantages heretofore experienced in devices used for this purpose and which shall be cheap and easy to manufacture.

A feature of my invention is an integral retaining member consisting of a central portion for engagement with the burnishing tool and two substantially parallel end portions for attachment to the tool holder.

Another feature of my invention is a retainer for a tool, formed of a single piece of metal, having a portion constructed for engagement with the tool and a portion eX- tending from this portion for attachment to- Specification of Letters Patent.

Patented May 6, 1919.

Serial No. 51,697.

the tool carrier having no sudden change in cross-sectional area. This feature avoids breakage of the retaining member.

The drawings show a preferred embodiment of my invention in connection with an edge setting machine of the type shown in the application of Furber, Ser. No. 9,343, filed Feb. 19, 1915.

In the drawings,

Figure 1 is a side elevation of the head of the machine, and

Fig. :2 is an exploded view of the tool holder and spring.

A shaft 10 is arranged to oscillate rapidly upon its axis in bearings not shown. It carrise at its end a head 11 upon which is mounted a tool holder 12. It is not necessary to go further into detail concerning the head of the machine as reference therefor may be had to'the application above referred to. The tool holder 12 has spindles 13 upon which are mounted the edge setting tools 14. The neck 15 of the edge setting tool fits over the spindle 13, there being a loose tongue and groove joint between them in order to prevent rotation of the tool on the spindle. The outside of the neck of the tool has a concave depression 16. The tool carrier may have a channel 17 in which are seated the arms of the retaining member about to be described. This member is shown at 18. It consists of a single piece of piano wire bent into a spiral 19 at its middle and having the two straight ends 20 bent substantially parallel to each other and at right angles to the axis of the spiral. The outside surface of the spiral is of substantially the same curvature as that of the depression 16. The ends 20 are placed in the channel 17 and clamped to the tool carrier by means of the set screw 21 and washer 22.

The retaining member is thus seen to be longitudinally adjustable to take up wear, and is preferably so adjusted that the spiral rests against the upper half of the depression 16 as shown in Fig. 1, thus holding the tool 14 firmly in place. It is well known that piano wire is the best and most uniformly tempered steel commercially obtainable. It will be seen also that the member 18 as shown has no sharp corners at which fatigue and consequent breakage are likely to be caused by the rapidly recurring vibrations to which the device is subject. It has been found also that this retaining member in operation possesses suflicient flexibility to permit a slight resilient rotation of the tool on the spindle, thereby rendering the edge setting operation much less fatiguing to the operator. It will be clear also that my novel spring sacrifices none of the advantages of easy removability and lnterchange of the edge setting tool possessed by devices of this for engaging the tool.

2. A retainer for an edge setting tool formed of a single piece of wire having a central enlarged portion and two substantially parallel end portions.

3. A spring formed of a single piece of metal having a portion constructed and arranged for engagement with 'a. burnishing tool and a reduced arm extending at an angle thereto.

4. In combination, a burnishing tool having an indentation, a head for carrying said tool, a retaining member formed of a single piece of piano wire having a portion bent to engage the indentation, and a portion constructed and arranged to be fastened to the tool carrying head.

5. In combination, a carrying member having a slot and means for mounting a burnishing tool thereon, a burnishing tool having a groove nd a retaining member comprising a single piece of wire having its end portions substantially parallel for engagement with said slot and its central portion so bent as to form an enlargement for engaging said groove.

6. A retainer for an edge setting tool formed of a single piece of metal having a portion constructed and arranged for engagement with the neck of the edge setting tool, and a portion extending from said engaging portion for attachment to the tool carrier, said portion being of substantially uniform, circular cross-sectional area throughout.

7 In combination, a burnishing tool having an indentation, an oscillating head carrying said tool, and a retainer formed of a single piece of tempered wire having its ends substantially parallel for engagement with said head and its middle portion bent in a coil to engage the indentation, the wire being without sharp bends at any point.

8. A retainer for an edge setting tool formed of a single piece of metal having a portion constructed and arranged for engagement with the neck of the edge setting tool, and a portion having no sudden changes in cross-sectional area extending from said engaging portion for attachment to the tool carrier, and a screw clamp for attaching the retainer to the tool carrier.

In. testimony whereof I have signed my name to this specification.

JAMES CAVANAGH.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents. Washington, D. 0. 

